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Leases - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | ---
Lessee, Lease, Description [Line Items] |  |  |
Lease assets | $ 208 | $ 192 |
Lease liabilities | $ 188 | $ 188 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease assets |  |  | $ 68
Lease liabilities |  |  | $ 66
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease, term of contract | 2 years |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease, term of contract | 6 years |  |

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- Definition Operating And Finance Lease, Liability + References No definition available. + Details
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Namespace Prefix: | tdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Operating And Finance Lease, Right-Of-Use Asset + References No definition available. + Details
Name: | tdc_OperatingAndFinanceLeaseRightOfUseAsset
Namespace Prefix: | tdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Details
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Period Type: |

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- Details
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Data Type: | na
Balance Type: |
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